Toshiba 32KV501B Bedienungsanleitung

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SERVICE MANUAL

LCD Color Television

32KV501B Ver. 1.00

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WARNING:

You are requested that you shall not modify or alter the information or data provided

herein without prior written consent by Toshiba. Toshiba shall not be liable to anybody

for any damages, losses, expenses or costs, if any, incurred in connection with or as a

result of such modification or alteration.

THE INFORMATION OR DATA HEREIN SHALL BE PROVIDED "AS IS" WITHOUT ANY

WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED WARRANTY OF

MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

Toshiba shall not be liable for any damages, losses, expenses or costs, if any, incurred

in connection with or as a result of use of any information or data provided herein.

IMPORTANT NOTICE

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The EC is actively promoting the WEEE & RoHS Directives that define standards for recycling

and reuse of Waste Electrical and Electronic Equipment and for the Restriction of the use of

certain Hazardous Substances. From July 1, 2006, the RoHS Directive will prohibit any

marketing of new products containing the restricted substances.

Increasing attention is given to issues related to the global environmental. Toshiba Corporation

recognizes environmental protection as a key management tasks, and is doing its utmost to

enhance and improve the quality and scope of its environmental activities. In line with this,

Toshiba proactively promotes Green Procurement, and seeks to purchase and use products,

parts and materials that have low environmental impacts.

Green procurement of parts is not only confined to manufacture. The same green parts used in

manufacture must also be used as replacement parts.

GREEN PRODUCT PROCUREMENT

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This product is manufactured using lead-free solder as a part of a movement within the

consumer products industry at large to be environmentally responsible. Lead-free solder must be

used in the servicing and repair of this product.

WARNING: This product is manufactured using lead free solder.

DO NOT USE LEAD BASED SOLDER TO REPAIR THIS PRODUCT!

The melting temperature of lead-free solder is higher than that of leaded solder by 86ºF to 104ºF

(30ºC to 40ºC). Use of a soldering iron designed for lead-based solders to repair product made

with lead-free solder may result in damage to the component and or PCB being soldered. Great

care should be made to ensure high-quality soldering when servicing this product especially

when soldering large components, through-hole pins, and on PCBs as the level of heat required

to melt lead-free solder is high.

LEAD-FREE SOLDER

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WARNING: BEFORE SERVICING THIS CHASSIS, READ THE "SAFETY PRECAUTION"

AND "PRODUCT SAFETY NOTICE" INSTRUCTIONS BELOW.

Safety Precaution

WARNING: SERVICING SHOULD NOT BE ATTEMPTED BY ANYONE UNFAMILIAR WITH

THE NECESSARY PRECAUTIONS ON THIS RECEIVER. THE FOLLOWING ARE THE

NECESSARY PRECAUTIONS TO BE OBSERVED BEFORE SERVICING THIS CHASSIS.

1. An isolation transformer should be connected in the power line between the receiver and

the AC line before any service is performed on the receiver.

2. Always disconnect the power plug before any disassembling of the product. It may result in

electrical shock.

3. When replacing a chassis in the cabinet, always be certain that all the protective devices

are put back in place, such as nonmetallic control knobs, insulating covers, shields,

isolation resistor-capacitor network, etc.

4. Always keep tools, components of the product, etc away from the children, These items

may cause injury to children.

5. Depending on the model, use an isolation transformer or wear suitable gloves when

servicing with the power on, and disconnect the power plug to avoid electrical shock when

replacing parts. In some cases, alternating current is also impressed in the chassis, so

electrical shock is possible if the chassis is contacted with the power on.

6. Always use the replacement parts specified for the particular model when making repairs.

The parts used in products require special safety characteristics such as inflammability,

voltage resistance, etc. therefore, use only replacement parts that have these same

characteristics. Use only the specified parts when the mark is indicated in the circuit

diagram or parts list.

7. Parts mounting and routing dressing of wirings should be the same as that used originally.

For safety purposes, insulating materials such as isolation tube or tape are sometimes

used and printed circuit boards are sometimes mounted floating. Also make sure that

wirings is routed and clamped to avoid parts that generate heat and which use high

voltage. Always follow the manufactured wiring routes / dressings.

8. Always ensure that all internal wirings are in accordance before re-assembling the external

casing after a repairing completed. Do not allow internal wiring to be pinched by cabinets,

panels, etc. Any error in reassembly or wiring can result in electrical leakage, flame, etc.,

SAFETY INSTRUCTION

panels, etc. Any error in reassembly or wiring can result in electrical leakage, flame, etc.,

and may be hazardous.

9. NEVER remodel the product in any way. Remodeling can result in improper operation,

malfunction, or electrical leakage and flame, which may be hazardous.

10. Touch current check. (After completing the work, measure touch current to prevent an

electric shock.)

Plug the AC cord directly into the AC outlet. Do NOT use an isolation transformer for

this check.

Connect a measuring network for touch currents between each exposed metallic part

on the set and a good earth ground such as a water pipe.

The potential at any point (TOUCH CURRENT) expressed as voltage and does

not exceed the following value:

Annex D

(normative)

Measuring network for TOUCH CURRENTS

Resistance values in orms (Ω).

Input resistance : 1 MΩ

Input capacitance : 200 pF

Frequency range : 15 Hz to 1 MHz and d.c. respectively

Note: Appropriate measures should be taken to obtain the correct value in case of

non sinusoidal waveforms.

The measuring instrument is calibrated by comparing the frequency factor of with

the solid line in figure F.2 of IEC 60990 at various frequencies. A calibration curve is

constructed showing the deviation of from the ideal curve as a function of

frequency.

TOUCH CURRENT = / 500 (peak value).

V: Voltmeter or oscilloscope

(r.m.s. or peak reading)

The part or contact of a TERMINAL is not HAZARDOUS LIVE if:

Note: The limit values of = 0.35 V (peak) for a.c. and = 1.0 V for d.c.

correspond to the values 0.7 mA (peak) a.c. and 2.0 mA d.c.

a) The open-circuit voltage should not exceed 35 V (peak) a.c. or 60 V d.c. or, if a)

is not met.

b) The measurement of the TOUCH CURRENT shall be carried out in accordance

with IEC 60990, with the measuring network described in Annex D of this

standard.

The TOUCH CURRENT expressed as voltages and , does not exceed the

following values:

- for a.c. : = 35 V (peak) and = 0.35 V (peak);

- for d.c. : = 1.0 V

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Product Safety Notice

Many electrical and mechanical parts in this chassis have special safety-related characteristics.

These characteristics are often passed unnoticed by a visual inspection and the protection

afforded by them cannot necessarily be obtained by using replacement components rated for

higher voltage, wattage, etc. Replacement parts which have these special safety characteristics

are identified in this manual and its supplements; electrical components having such features are

identified by the international hazard symbols on the schematic diagram and the parts list.

Before replacing any of these components, read the parts list in this manual carefully. The use of

substitute replacement parts which do not have the same safety characteristics as specified in

the parts list may create electrical shock, fire, or other hazards.

SAFETY INSTRUCTION

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Handling the LCD Module

Safety Precaution

In the event that the screen is damaged or the liquid crystal (fluid) leaks, do not breathe in or

drink this fluid.

Also, never touch this fluid. Such actions could cause toxicity or skin irritation. If this fluid should

enter the mouth, rinse the mouth thoroughly with water. If the fluid should contact the skin or

clothing, wipe off with alcohol, etc., and rinse thoroughly with water. If the fluid should enter the

eyes, immediately rinse the eyes thoroughly with running water.

Precautions for Handling the LCD Module

CAUTION: The metal edges of the LCD module are sharp, handle it with care.

The LCD module can easily be damaged during disassembly or reassembly; therefore, always

observe the following precautions when handling the module.

1. When attaching the LCD module to the LCD cover, position it appropriately and fasten at

the position where the display can be viewed most conveniently.

2. Carefully align the holes at all four corners of the LCD module with the corresponding holes

in the LCD cover and fasten with screws. Do not strongly push on the module because any

impact can adversely affect the performance. Also use caution when handling the polarized

screen because it can easily be damaged.

3. If the panel surface becomes soiled, wipe with cotton or a soft cloth. If this does not remove

the soiling, breathe on the surface and then wipe again.

SAFETY INSTRUCTION

the soiling, breathe on the surface and then wipe again.

If the panel surface is extremely solied, use a CRT cleaner as a cleaner. Wipe off the panel

surface by drop the cleaner on the cloth. Do not drop the cleaner on the panel. Pay

attention not to scratch the panel surface.

4. Leaving water or other fluids on the panel screen for an extended period of time can result

in discoloration or stripes. Immediately remove any type of fluid from the screen.

5. Glass is used in the panel, so do not drop or strike with hard objects. Such actions can

damage the panel.

6. CMOS-LSI circuitry is used in the LCD module, so avoid damage due to static electricity.

When handling the module, use a wrist ground or anchor ground.

7. Do not expose the LCD module to direct sunlight or strong ultraviolet rays for an extended

period of time.

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